c# - Question Mark ("?") Getting Appended to String -


so writing program , using existing library written else. library making call themoviedatabase.com , retrieving information movie, including youtube trailer name 'serd7y00r_8'.

when debugging , view trailer name string variable value stored in, appears 'serd7y00r_8', when gets inserted database or printed console seems append ? (question mark) end , appears this: 'serd7y00r_8?'

this causing me problems obviously. cannot figure out why doing , how fix it. can guess non regular text character or something, guess.

here link wrapper library: https://github.com/lordmike/tmdblib/

this method call in wrapper library, passing in id 143049:

tmdblib.objects.movies.movie tmdbmovie = client.getmovie(id, moviemethods.credits | moviemethods.keywords | moviemethods.images | moviemethods.trailers | moviemethods.reviews | moviemethods.releases);

and here print console after:

console.writeline("'" + tmdbmovie.trailers.youtube[i].source + "'");

.length property returns 12 appears 1 character not show in debugger prints out ? in console

per comment printed out encoding.getbytes details:

encoding entire string: system.text.utf7encoding       : 20  38  :73 45 72 44 37 59 30 30 52 2b 41 46 38 2d 38 2b 49 41 34 2d  system.text.utf8encoding       : 14  39  :73 45 72 44 37 59 30 30 52 5f 38 e2 80 8e  system.text.unicodeencoding    : 24  26  :73 00 45 00 72 00 44 00 37 00 59 00 30 00 30 00 52 00 5f 00 38 00 0e 20  system.text.unicodeencoding    : 24  26  :00 73 00 45 00 72 00 44 00 37 00 59 00 30 00 30 00 52 00 5f 00 38 20 0e  system.text.utf32encoding      : 48  52  :73 00 00 00 45 00 00 00 72 00 00 00 44 00 00 00 37 00 00 00 59 00 00 00 30 00 00 00 30 00 00 00 52 00 00 00 5f 00 00 00 38 00 00 00 0e 20 00 00

debug screenshot

it seems question mark appears because encoding mismatch , since string should in ascii encoding can remove non-ascii characters resolve mismatch.

to can use regex find non-ascii characters([^\u0000-\u007f]) , replace them empty string: 

str=regex.replace(str, @"[^\u0000-\u007f]", string.empty);

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